Regarding the list of components, you have the diagram where the values are specified.
You open the site where you buy electronic components and add the necessary ones.
Simple.... 😎 👍🤪
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C0G/NP0 it"s ok in my opinion.
You open the site where you buy electronic components and add the necessary ones.
Simple.... 😎 👍🤪
-------------------------
C0G/NP0 it"s ok in my opinion.
I think I may go with 50v 100nF PPS actually, they are IMHO superior to ceramic caps.
Anyone who can share the LTSpice simulation file?
I want to check mW across the resistors among other things. I have a lot of very nice TH resistors, but some are rated at 125mW. I want to check which positions, if any, those are ok to use. I also want to check a few other things. I can make the schematic myself in LTSpice, but why re-invent the wheel if someone here can share the simulation file. Thanks
I want to check mW across the resistors among other things. I have a lot of very nice TH resistors, but some are rated at 125mW. I want to check which positions, if any, those are ok to use. I also want to check a few other things. I can make the schematic myself in LTSpice, but why re-invent the wheel if someone here can share the simulation file. Thanks
I'm guessing no one has done simulations for this circuit. Oh well, I'll do it when I have the time and the pain isn't too bad 🙂
I was not complaining. English is not my first language, so I'm sorry if it came across as complaining.
Just didn't want to re-invent the wheel if someone had a simulation file already.
It would take me a lot longer than 20min, maybe I'm not as skilled as you 🙂
Just didn't want to re-invent the wheel if someone had a simulation file already.
It would take me a lot longer than 20min, maybe I'm not as skilled as you 🙂
Another Sapphire is alive! Finished building this a few weeks ago now. This is the first time I've built something this complex before and I'm quite happy with the result.
One issue I do have is that with IEMs I can hear a constant 60Hz hum that I'm certain is coming from the power supply. If I switch off the power the hum instantly goes away, turn it back on, hum is back. The sound does change with volume and actually gets quieter as a increase the volume. I'm at a loss as to what's going on here?
I attached some progress photos.
Cheers
One issue I do have is that with IEMs I can hear a constant 60Hz hum that I'm certain is coming from the power supply. If I switch off the power the hum instantly goes away, turn it back on, hum is back. The sound does change with volume and actually gets quieter as a increase the volume. I'm at a loss as to what's going on here?
I attached some progress photos.
Cheers
Attachments
I've now measured all my BC327&BC337.
I can get perfect matches within NPN or PNP, not so much NPN-PNP. Advice on this is greatly appreciated.
The BOM also says Hfe 400...none of the 400 transistors I've measured has a Hfe that high. I hope you can read my handwriting 😅
PS. All devices measured with the Atlas DCA75 Pro.
I can get perfect matches within NPN or PNP, not so much NPN-PNP. Advice on this is greatly appreciated.
The BOM also says Hfe 400...none of the 400 transistors I've measured has a Hfe that high. I hope you can read my handwriting 😅
PS. All devices measured with the Atlas DCA75 Pro.
Attachments
It doesn't matter THB. The only thing that will change is the DC offset at the output.
I guess I'll use the BC327 w Hfe 322 and the BC337 with Hfe 244. At least they'll be matched NPN and PNP, though not between NPN and PNP 😅
Likely a ground loop/earthing issue. The BOM has some recommendations on how to earth the assembly so I would start there. They can sometimes be a little tricky to cure. My test build had a hum issue which turned out to be the temp poor quality volume pot and earthing the metal shell cured it.